Firms that earn millions of dollars each year helping Nassau residents challenge their property taxes contributed $15,000 to County Executive Laura Curran, who has pledged to reform the assessment system, new campaign finance reports show.

Curran, a Baldwin Democrat who took office Jan. 1, got $5,000 from Sean Acosta, who runs Property Tax Reduction Consultants in Jericho, and $5,000 from Shalom Maidenbaum, who owns three local tax grievance firms, according to State Board of Elections filings covering the period Dec. 1-Jan. 12.

The Committee for Fair Property Taxes, a political action committee formed by the county’s largest tax grievance firms, also gave Curran $5,000, records show.

Curran spokesman Michael Martino defended the contributions, noting that Democratic and Republican officials have accepted them for years.

“These are regular donors to both parties,” Martino said.

Nassau County’s “financial mess is intertwined with the assessment mess and everything needs to be fixed,” he said.

In total, Curran raised $142,475 and has $48,742 on hand, records show. Her top contributor was the Citizens for Tom Gulotta PAC, which gave $10,000, the reports show. Gulotta was the GOP county executive from 1987 through 2001.

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Acosta, Maidenbaum and the committee gave a combined $46,000 to Curran since she announced her run for county executive in 2016, records show.

Curran is hoping to make significant changes to Nassau’s assessment system. Mangano had tried to reduce the county’s costs for property tax refunds. But his policy of offering assessment reductions before tax bills went out created a greater imbalance between those who grieved their assessments and those who didn’t.

She appointed a task force to review the assessment system, plans to boost staffing at the Assessment Department and promised to hire a credentialed assessor to run the agency.

“We have supported many candidates from both parties, and like Laura Curran, we are committed to protecting the rights of taxpayers and reforming the assessment system,” Maidenbaum said.

Acosta said he supported Curran’s proposed assessment reforms. “I contribute to people who will fight for the taxpayer,” he said.

Paola Orsini, treasurer for the Committee for Fair Property Taxes, did not respond to a request for comment. Orsini runs Re-Assessment & Evaluation Services, a Garden City tax grievance firm.

Tax grievance firms were among Mangano’s top contributors during his two terms.

Acosta, Maidenbaum, and their spouses gave Mangano nearly $174,000, campaign finance records show. The Committee for Fair Property Taxes contributed more than $61,000 to the Bethpage Republican’s campaign committee.

Mangano, who did not seek a third term as he fights federal corruption charges, settled property tax grievance cases at a higher rate than previous administrations. The firms collect half of any first-year assessment reduction as their fee.

Mangano did not raise any money during his final six months in office and spent $24,486, records show. He has just over $1 million on hand.

In Suffolk County, new Democratic District Attorney Timothy Sini raised $88,450 between Dec. 1 and Jan. 12, spent $37,085 and has $94,552 on hand, records show.

Sini’s top donor was Amneal Pharmaceutical of Hauppauge, which gave $10,000. Recycler Kevin Gershowitz of Melville, a member of the county planning commission from Melville, Deer Park Industrial Property LLC of Islandia, SVAM International Inc. of Great Neck, GFC Realty LLC of Hauppauge and the Association of Municipal Employees PAC each gave $5,000.

Suffolk County Executive Steve Bellone raised $115,459 during the period, spent $75,662 and has $2.12 million on hand. His largest donors were developer David Mack, John Corr, chief executive of Educational Bus Transportation Inc. and Manhattan 24 Realty Corp., which each gave $5,000.

Campaign finance reports show the Suffolk Democratic Committee still has $300,000 in unpaid loans from seven party supporters that financed the bulk of Toulon’s campaign. Party officials expect to repay the money after the party’s spring dinner.

With Rick Brand

LAURA CURRAN’S TOP DONORS

Citizens for Tom Gulotta PAC: $10,000

Committee for Fair Property Taxes: $5,000

Sean Acosta, owner, Property Tax Reduction Consultants: $5,000

Eric Blumencranz, chairman, Nassau County Police Foundation: $5,000

Shalom Maidenbaum, owner of three tax grievance firms: $5,000

Mohsin Meghji, managing partner at M-III Partners LLC: $5,000

Ijaz Ahmad, cardiologist: $5,000

Surinder Chabra, chief executive of Agilant Solutions Inc.: $5,000

Source: State Board of Elections campaign reports for the period from Dec. 1-Jan. 12